Several top mp3 search engines: Tom  Yahoo  Altavista  Baidu  Sogou  Gougou, 
I find them on the site: http://mp3.forou.com/
Most are in Chinese, Baidu is the largest mp3 search engines, Gougou can search BT, ftp, emule files.
If you search mp3 via forou.com, first to choose one search engine 
(click the circle in front of the search engnine name, first one is default), 
then input some key words, click "search".
You can also search the same words on other search engine via forou.com, need not retype.